8.8.2. Lines

8.8.2. Lines

8.8.2.线

Lines are represented by the linear equation Ax + By + C = 0, where A and B are not both zero. Values of type line are input and output in the following form:

直线由线性方程Ax + By + C = 0表示，其中A和B不都为零。输入line类型的值的格式如下：

{ A, B, C }

Alternatively, any of the following forms can be used for input:

可选的，以下任一种个数均可在输入时使用：

[ ( x1 , y1 ) , ( x2 , y2 ) ]

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( ( x1 , y1 ) , ( x2 , y2 ) )

( x1 , y1 ) , ( x2 , y2 )

x1 , y1 , x2 , y2

where (x1,y1) and (x2,y2) are two different points on the line.

(x1,y1)和(x2,y2)为线上的两个不同的点。